ROSA: Add support for MachinePoolsMachines

[muraee]

/kind feature

Describe the solution you'd like ROSAMachinePools should support MachinePoolsMachines

Anything else you would like to add: see https://github.com/kubernetes-sigs/cluster-api/blob/11620ba36a789cfcbeab76882025be6ca907f24b/docs/proposals/20220209-machinepool-machines.md#enabling-machinepoolmachines

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

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